<s>
.cd	O
is	O
the	O
Internet	B-Application
country	I-Application
code	I-Application
top-level	O
domain	O
(	O
ccTLD	B-Application
)	O
for	O
the	O
Democratic	O
Republic	O
of	O
the	O
Congo	O
.	O
</s>
<s>
It	O
was	O
created	O
in	O
1997	O
as	O
a	O
replacement	O
for	O
the	O
.zr	B-General_Concept
(	O
Zaire	O
)	O
ccTLD	B-Application
,	O
which	O
was	O
phased	O
out	O
and	O
eventually	O
deleted	O
in	O
2001	O
.	O
</s>
<s>
The	O
ccTLD	B-Application
is	O
popular	O
(	O
and	O
thus	O
economically	O
valuable	O
)	O
owing	O
to	O
it	O
being	O
an	O
abbreviation	O
for	O
compact	O
disc	O
(	O
other	O
similar	O
ccTLDs	B-Application
are	O
.fm	B-Protocol
,	O
.am	B-General_Concept
,	O
.tv	B-Protocol
,	O
.dj	O
,	O
.mu	O
,	O
and	O
.me	B-Application
)	O
.	O
</s>
<s>
Such	O
unconventional	O
uses	O
of	O
TLDs	O
in	O
domain	O
names	O
are	O
known	O
as	O
domain	B-Application
hacks	I-Application
.	O
</s>
<s>
.zr	B-General_Concept
is	O
the	O
former	O
Internet	B-Application
country	I-Application
code	I-Application
top-level	O
domain	O
(	O
ccTLD	B-Application
)	O
for	O
Zaire	O
.	O
</s>
<s>
When	O
Zaire	O
was	O
renamed	O
to	O
Democratic	O
Republic	O
of	O
the	O
Congo	O
in	O
1997	O
,	O
.zr	B-General_Concept
was	O
phased	O
out	O
and	O
.cd	O
took	O
its	O
place	O
.	O
</s>
<s>
In	O
2001	O
,	O
.zr	B-General_Concept
was	O
deleted	O
.	O
</s>
